load and display image using CDC

Use the following as a guide:

1. Get the image (path below must be absolute):

public static Image getImage(String filename) throws ScanException {

Image img = null;

// Read paths from properties file

StringBuffer buf = new StringBuffer("\\");

buf.append(ScanUtility.getPathImages());

buf.append("\\");

buf.append(filename);

buf.append(".jpg");

File dataFile = new File(buf.toString());

if(!dataFile.exists())

throw new ScanException("Cannot locate the file:\n" + dataFile.getAbsolutePath());

img = Toolkit.getDefaultToolkit().createImage(buf.toString());

return img;

}

2. Create a class to display the image (pass in the image, above):

ImagePanel class source:

import java.awt.*;

import java.awt.image.*;

public class ImagePanel extends Panel {

private Image image = null;

private Image scaledImage = null;

private boolean imageComplete = false;

public ImagePanel(Image img) {

image = img;

scaledImage = image.getScaledInstance(200, -1, Image.SCALE_DEFAULT);

prepareImage(scaledImage, this);

}

// Override the paint method, to render the image

public void paint(Graphics g) {

if(imageComplete) {

g.drawImage(scaledImage, 0, 0, this);

}

}

// Override imageUpdate method, to prevent repaint() from trying

// to do anything until the image is scaled

public boolean imageUpdate(Image img, int infoFlags, int x, int y, int w, int h) {

if(infoFlags == ImageObserver.ALLBITS) {

imageComplete = true;

repaint();

}

return super.imageUpdate(img, infoFlags, x, y, w, h);

}

public void flush() {

image.flush();

scaledImage.flush();

image = null;

scaledImage = null;

}

}

joe.coma at 2007-7-12 19:00:55 >